docs: def add_service(self, loadbal_id, service_group_id, ip_address_id,
                      port=80, enabled=True, hc_type=21, weight=1):
          """Adds a new service to the service group.
  
          :param int loadbal_id: The id of the loadbal where the service resides
          :param int service_group_id: The group to add the service to
          :param int ip_address id: The ip address ID of the service
          :param int port: the port of the service
          :param bool enabled: Enable or disable the service
          :param int hc_type: The health check type
          :param int weight: the weight to give to the service
          """
          kwargs = utils.NestedDict({})
          kwargs['mask'] = ('virtualServers['
                            'serviceGroups[services[groupReferences]]]')
  
          load_balancer = self.lb_svc.getObject(id=loadbal_id, **kwargs)
          virtual_servers = load_balancer['virtualServers']
          for virtual_server in virtual_servers:
              if virtual_server['id'] == service_group_id:
                  service_template = {
                      'enabled': int(enabled),
                      'port': port,
                      'ipAddressId': ip_address_id,
                      'healthChecks': [
                          {
                              'healthCheckTypeId': hc_type
                          }
                      ],
                      'groupReferences': [
                          {
                              'weight': weight
                          }
                      ]
                  }
                  services = virtual_server['serviceGroups'][0]['services']
                  services.append(service_template)
  
          return self.lb_svc.editObject(load_balancer, id=loadbal_id)